LM2575

HTC Korea LM2575 series of regulators are monolithic integrated circuits ideally suited for easy and convenient design of a step-down switching regulator (buck converter). All circuits of this series are capable of driving a 1A load with excellent line and load  regulation. These devices are available in fixed output voltages of 3.3V, 5.0V,12V, and an adjustable output version voltages range from 1.23V to 37V. These regulators were designed to minimize the number of external components to simplify the power supply design. Standard series of inductors optimized for use with the LM2575 are offered by several different inductor manufacturers. Since the LM2575 converter is a switch-mode power supply, its efficiency is significantly higher in comparison with popular three-terminal limear reguators, especially with higher input voltages. In many cases, the power dissipated is so low that no heatsink is required or its size could be reduced dramatically. A standard series of inductors optimized for use with the LM2575 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies. The LM2575 features include a guaranteed ±4% tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency (±2% over 0°C to 125°C). External shutdown is included, featuring 80μA (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.

LM2575 features :

• 3.3V, 5.0V, 12V and adjustable output versions
• Adjustable version output voltage range
• Wide input voltage range
• Guaranteed 1A output current
• 52kHz fixed frequency internal oscillator
• Voltage mode non-synchronous PWM control
• On/off shutdown control input
• Thermal shutdown and current limit protection
• Moisture sensitivity level 3 for SMD packages

LM2575 applications :

• Simple high-efficiency step-down (Buck) regulator
• Efficient pre-regulator for linear regulators
• On-card switching regulators
• Positive to negative converter (Buck-Boost)